scmutil: introduce function to check whether repo uses treemanifest or not
In an upcoming patch, I wanted to check whether current repo uses treemanifest
or not.
I looked for a function and found that at all places we manually check for the
requirement in repo requirements. I guess having a dedicated function for that
is much better.
Differential Revision: https://phab.mercurial-scm.org/D8981
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}